Business school is meaningful for my life?

Nowadays I think to go to Globis business school. The reason is that I feel I didn't raise my skill for being promoted like management, strategy thinking, facilitation, negotiation, and so on. There is no limit, anyway I want to drive my growing. 

So I join the explanatory meeting of that school and listen to my collegue of the  experience of that school. To talk straight, I think it is meaningful for me because we are trained the skills that I want to raise. The main way of class is discussion. We exchange our opinion and thought, and we are ctriticized seriously that is important to expand our thinking framework.

But my collegue said "I also agree it is meaningful for us, but to go to the school is not necessary I think because the way of the class is same for consulting work, in short we are consultant and everyday we do it. Of course to study the specific subject like Accounting, Finance, Venture business is worth. Yet, we can study them ourselves, or to attend the specific class for one class system that is the Globis' system. I don't reccomend to go to school."

I understand his oppinion. If I go to the school, I do same work as a consultant in the class. And it costs about 3 million yen. Now I don't decide to go or no go. Again I will think about what is neccessary for me to raise  my skills and accelarate growing up as a business man.